kou commented on issue #51690:
URL: https://github.com/apache/arrow/issues/51690#issuecomment-5962296474

   I think that this is not a blocker.
   
   It seems that 
https://github.com/apache/arrow/blob/e85e181188ac3c5e8407b2160331faf5e78fd429/cpp/cmake_modules/SetupCxxFlags.cmake#L56
 introduced by https://github.com/apache/arrow/pull/46963 is the cause of this. 
It's already included in our past releases. We can fix it in the next release.
   
   BTW, I feel that the approach used by #46963 is not a good approach because 
it always defines `__*__` globally by `add_definitions()` (other SIMD related 
flags cares about `ARROW_SIMD_LEVEL`) and we should not define `__*__` macros 
as much as possible (I think that 
https://github.com/simdjson/simdjson/issues/2864#issuecomment-5716211702 is 
correct).


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